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William O. Reece (2009). Functional Anatomy and Physiology of Domestic Animals. 4th ed. USA: John Wiley & Sons. 577.
David F. Albertini, Lucia De Santis (2013). Oogenesis. USA: Springer. 364.
Defra . (2009). Dairy cattle - key welfare issues. [Online]: http://www.rspca.org.uk/allaboutanimals/farm/cattle/dairy/keyissues. [Last accessed 24th Mar 2013].
Defra . (2012). Farming Statistics - Livestock Populations at 1 December 2012, UK and England. [Online]: http://www.defra.gov.uk/statistics/files/defra-stats-foodfarm-landuselivestock-farmstats-dec2012-130314.pdf. [Last accessed 24th Mar 2013].
ELMARTIN FARM. (2012). Milk - Holstein Breed. [Online]: http://wwwid.tripod.com/elmartinfarm/id24.html. [Last accessed 24th Mar 2013].
James R. Gillespie, Frank Bennie Flanders (2010). Modern Livestock and Poultry Production. 8th ed. USA: Cengage Learning. 1060.
John B, Jenkins (1990). Human Genetics. 2nd ed. USA: Harper & Row. 544.
Kelly. (2007). Farm Animals Face Extinction. [online]: http://www.biology-blog.com/blogs/permalinks/9-2007/farm-animals-face-extinction.html.[ Last accessed 24th Mar 2013].
Lauralee Sherwood (2010). Human Physiology: From Cells to Systems. 7th ed. USA: Cengage Learning. 928.
Matthew B. Wheeler. (No Date). Agricultural applications for transgenic livestock. [Online]: http://ilearn.bishopburton.ac.uk/file.php/831/Transgenics_in_production_animals.pdf. [Last accessed 24th Mar 2013].
Michael Roberts, Neil Ingram (2001). Biology . 2nd ed. London : Nelson Thornes. 338.
Office of National Statistics . (2010). Population Growth. [Online]: http://www.ons.gov.uk/ons/rel/npp/national-population-projections/2010-based-projections/stb-2010-based-npp-principal-and-key-variants.html. [Last accessed 24th Mar 2013].
Rowen D. Frandson, W. Lee Wilke, Anna Dee Fails (2009). Anatomy and Physiology of Farm Animals. 7th ed. USA: John Wiley & Sons. 51
Sophie Hart (2012), Pre and Post Partum Diseases, PowerPoint presentation, Bishop Burton College, Bishop Burton
SWNS. (2010). Cow gives birth to triplets of different breeds. [Online]: http://www.telegraph.co.uk/earth/agriculture/farming/7906428/Cow-gives-birth-to-triplets-of-different-breeds.html. [Last accessed 24th Mar 2013].
Tony L. J. Lawrence, Vernon R. Fowler, Jan E. Novakofski (2012). Growth of Farm Animals. 3rd ed. UK: CABI. 352.
Tiziana A. L. Brevini, Georgia Pennarossa (2013). Gametogenesis, Early Embryo Development and Stem Cell Derivation. USA: Springer. 78.
William O. Reece (2009). Functional Anatomy and Physiology of Domestic Animals. 4th ed. USA: John Wiley & Sons. 577.